usehooks
usehooks copied to clipboard
default value for usePrevious hook
The current behavior of the usePrevious hook is to always return null as the previous value. But in some cases, it makes sense to have a different default value. For example for a table's data we don't want to pass null as the value instead we want to pass an empty array:
function MyTable({data, loading}){
const previousData = usePrevious(data);
// This throws an exception when the component gets rendered with loading true:
const table = useReactTable({data: loading ? previousData: data});
return (
// ...
);
}
Instead, I would like to be able to set an initial value for the hook:
function MyTable({data, loading}){
const previousData = usePrevious(data, []);
// No error this time since previousData is [] at first render when loading is true:
const table = useReactTable({data: loading ? previousData: data});
return (
// ...
);
}